Girder construction.



Patented Mar. I9, |901.

C. M. CABNAHAN.

GIHDER CDNSTRUCTION.

(Application led May` 1, 1900.)

(No Model.)

greffes @Arent FFIC@ CYRUS M. CARNAl-IAN, OF ALLEGHENY, PENNSYLVANIA.

GIRDER CONSTRUCTION.

SPECZFICATION forming part of Letters Patent No. 670,309, dated March19, 1901.

Application tiled May l, 1900.

7 0 t/Z whom t may con/cern:

Be it known that I, CvRUs M. CARNAHAN, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ol'Pennsylvania, have invented certain new and useful Improvements inGirder Construction, of which the following is a specication, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure 1 is a perspective detail View showingmy improved box-girder in cross-section. Fig. 2 is a cross-sectionalview illustrating a cross -beam member incorporated with the girder.Fig. 3 is a similar view in perspective. Fig. 4 is a view similar toFig. 2, illustrating a double-sided construction and showing the mannerof mounting the tiling.A Fig. 5 is a sectional View at right angles toFig. 4, illustrating the manner of framing a crossbeam of the samecross-section into the girder. Figs. 6 and 7 are cross-sectional detailviews illustrating modified constructions. Fig. 8 is a detailcross-sectional view of' one of the lateral members.

My invention consists of an improvement in girder construction wherein Iemploy two erm ore members of rolled metal incorporated in such a manneras to provide a hollow-box construction of great stiffness andweight-supporting strength.

The object of the invention is to provide such a girder at low costwhich shall be easily applied to the various uses to which suchconstructions are put and adapted to be connected and incorporated withthe other interacting members of such structures in which it may beemployed.

Referring' now to the drawings, 2 represents a plate of any lengthdesired and a depth suited to the requirements in view and correspondingto the full depth of the iinished girder. To one or both sides of theplate 2 I secure by rivets 3 one or two longitudinally-disposed lateralrolled members, bent so as to provide vertical flange portions 4 4,adapted to fit against and correspond to the vertical face of plate 2,lateral portions 5, and intermediate reversed inclined portions 6,extending inwardly toward a point between the vertical flange portionswhere the member is bent,

Serial No. 15,155. KNO znoilcl.

such bent portion providing a convenient means for attachment byriveting to the plate 2. I have shown these characteristic elements invarious arrangements and amplifications in upper and lower doublearrangement on one side and on both sides of the plate, and in all ofthe forms it will be observed that the lateral members are firmly joinedby rivets.

In Figs. 6 and 7 I have shown constructions wherein all of theoutwardly-extending faces are inclined, the general principles ofconstruction, however, being closely similar to the form I havedescribed, in that the lateral members are provided with verticalriveting portions and outwardly-extending lateral portions meeting at anangle.

The principal advantage of the horizontal portions 5 is in providingflat bearing-faces for building, erecting, or construction purposes, sothat it will be obvious that in the absence of' the necessity of suchbearingfaces the sides may be disposed at varying angles within thescope of the invention.

In certain of the forms I have also shown the meeting angle of thelateral members somewhat flattened, so as to provide a face 7, thusproviding a convenient means for attachment of other constructions byriveted angle-plates, as clearly shown in Figs. 2, 3, 4, and 5. 'When itis desired to assemble or frame in other members with thegirder, themiddle portion of the lateral member may be cut out between the upperand lower portions 5 and of the proper width, as shown, permitting theattached member to abut against the plate 2 and to rest firmly withinand upon the lateral member.

While I have shown the lateral member as incorporated with the centralplate member, it is obvious that the plate member may be dispensed withand two of the lateral members (comprising the vertical attachingportions, the outwardly-disposed lateral portion, and the interveningrecessed portion, either flattened or simply rounded) in entirety assingle members may be directly connected face to face with good results.Also, as in the case of' ship construction, these lateral members may beemployed as ribs incorporated in the framework and forming bases fordirect attachment of the plates.

IOO

Many changes, Variations, and adaptations may be made in my invention hythe skilled mechanic without departing from it as expressed in theclaims, and I desire to include all snc-l1 within their scope.

Vhat I claim is-n l. In metallic construction, en integral girder memher provided with n p per and lower vertical flange portions,ontwl-Lrdly-disposed lateral portions, and inwardly-sloping intenmediate portions with an intervening attaching portion in alinement withthe flange portions, substantially as set forth.

2. In metallic construction, an integral girder member provided withupper and lower vertical flange portions, ontwardly-disposed lateralportions, vertical attaching portions, inwardly-sloping intermediateportions with an intemvoninfgI attaching portion in alinex ment with theflange portions, substantially' zo as set forth.

3. A composite girder consisting of a plate

